CYMA Standard M4 Airsoft AEG Rifle w/ Built In Mosfet & Tracer Hop Up (Color: Black / 8.5" / Gun Only)

"Awesome gun for the price but don't buy it for the QBS system because it doesn't have it. After contacting Evike I sent the first one back they verified that you have to remove the gearbox to change the spring even though it had the QBS receiver witch is not what the listing says. Evike sent me a new one and the second one has the same issue no QBS spring guide. The gun itself is built well and the ambi mag release is nice. I put different brand mags through it from Polymer mags to metal mags and everything fed perfectly. The tracer hop up works good also.

"Great gun but does not have the QBS spring system like the description shows so I sent the first one back and they confirmed the problem with it not having the threaded spring guide it shows in the pictures so they sent me another one and the second one has the same problem you can't change the spring without removing the gear box from the receiver. So this one will be going back as well witch is too bad because this thing is awesome but not as advertised. Maybe this time they will have their tech team disassemble the receiver remove the gearbox remove the QD spring guide and install the proper $18 QBS spring guide so the gun is correct and 100%. As far as the build quality it's a 10 out of 10. The tracer hop unit works well and the ambidextrous mag release is nice. Good rate of fire and good FPS out of the box. Its a lot of features for the price but the spring situation is a deal breaker for me.